<em>Пошаговое объяснение:</em>
<em>1. 13 1/2 · 1 1/2 : 2 1/4 = 9</em>
<em>13 1/2 · 1 1/2 = 27/2 · 3/2 = 27·3/2·2 = 81/4 = 20 1/4</em>
<em>20 1/4 : 2 1/4 = 81/4 · 4/9 = 81·4/4·9 = 9/1 = 9</em>
<em>2. 15/16 : 5/8 · 1 1/9 = 1 2/3</em>
<em>15/16 : 5/8 = 15/16 · 8/5 = 15·8/16·5 = 3/2 = 1 1/2</em>
<em>1 1/2 · 1 1/9 = 3/2 · 10/9 = 3·10/2·9 = 5/3 = 1 2/3</em>
<em>3. 13/14 : 1 4/21 : 13/5 = 3/10</em>
<em>13/14 : 1 4/21 = 13/14 · 21/25 = 13·21/14·25 = 39/50</em>
<em>39/50 : 13/5 = 39·5/13·50 = 3/10</em>
<em>4. 4 9/38 · 5/23 : 7/19 = 2 1/2</em>
<em>4 9/38 · 5/23 = 161/38 · 5/23 = 161·5/38·23 = 35/38</em>
<em>35/38 : 7/19 = 35·19/38·7 = 5/2 = 2 1/2</em>
<em>5. 2 16/19 · 2 1/9 : 3 3/8 = 1 7/9</em>
<em>2 16/19 · 2 1/9 = 54/19 · 19/9 = 54·19/19·9 = 6/1 = 6</em>
<em>6 : 3 3/8 = 6·8/27 = 16/9 = 1 7/9</em>